\documentclass{standalone}
	
\usepackage[siunitx]{circuitikz}

\begin{document}

\begin{circuitikz}[scale=1., transform shape, american voltages]
    \draw (-3,-.5) -- (1,-0.5) -- (1,3.5) -- (-3,3.5) -- (-3,-0.5);
    \draw (-3.5,0) node[anchor=east] {$sn2$};
    \draw (-3.5,3) node[anchor=east] {$sn1$};
    \draw (-2, 0) to[short, i<^=$i_s$] (-2, 3);
    \draw (-3.5, 0) to[short, *-] (-2, 0);
    \draw (-3.5, 3) to[short, *-] (-2, 3);
    \draw (1.5,0) node[anchor=west] {$n2$};
    \draw (0,0) to[short, -*] (1.5,0);
    \draw (0,0) to[cV=$\alpha \cdot i_{s}$] (0, 3);
    \draw (1.5,3) node[anchor=west] {$n1$};
    \draw (0,3) to[short, -*] (1.5,3);
\end{circuitikz}

\end{document}
